Streptavidin is a tetrameric protein， with each subunit able to bind a single molecule of the vitamin biotin. Streptavidin-biotin bond is the strongest known non-covalent interaction with Kd ~10-15 M， and exhibits less nonspecific binding than avidin. Streptavidin is used extensively in molecular biology and bionanotechnology due to the streptavidin-biotin complex's resistance to organic solvents， denaturants， detergents， proteolytic enzymes， and extremes of temperature and pH.分子量60 kDa
产品形式
Streptavidin: horseradish peroxidase conjugates show negligible non-specific binding to non-biotinylated macromolecules and therefore give very low backgrounds。
